Electromagnetic device



15, 1936. A. STEIN 2,064,700

ELECTROMAGNETIC DEVICE lruled June 18, 1935 62 vll/ 'l/llllll Patented Dec. 15, 1936 UNITED STATES PATENT OFFICE 2,064,700 ELECTROMAGNETIC DEVICE Alexander Stein, Philadelphia, Pa.

Application June 18, 1935, Serial No. 27,254

6A Claims. (Cl. F15-345) 'Ihis invention relates to electromagnetic de- Referring to the drawing, the supporting struc vices generally and, more particularly, to electroture of the device comprises a plurality of paralmagnetic recording devices for use in telephone lel rods I which are adapted to support the varisystems and the like. The device of this invenous elements in the manner described hereinafter.

tion lends itself nicely to the recording or reg- Preferably, there are four of the supporting rods 5 istering of telephone calls but it may be vused arranged as illustrated but it is within the scope in any instance Where an electromagnetic reof the invention'to provide any desired number corder or register is desired. Moreover, the inof these rods. The electromagnet comprises a VeniOn. 0r certain features thereof, iS aDpllCawinding 2 and an associated magnetic core 3,

10 ble bradly t0 the general field 0f electromagthese elements being mounted between and se- 10 netic devices. cured to spaced supporting plates I having open- One object of the invention is to provide a ings therein to accommodate the rods I, as clearnovel electromagnetic structure which is adaptly illustrated in Fig. 3. The supporting plates ed to operate in any position and which is so 4 of the electromagnet unit are removably held constructed that the armature of the device will in proper position upon the supporting rods I by 15 not stick or become inoperative regardless of the sleeves 5 and B whose inner ends abut against position of the device during operation. the plates 4 and whose outer ends abut against Another object of the invention is to provide end plates 1 of the device, as seen in Fig. 3. The a. novel electromagnetic structure which is comsleeves 5 and 6 are adapted to fit snugly upon posed of readily removable parts whereby the the supporting rods I and the end plates 'I are 20 `device may be completely disassembled for relprovided with apertures to accommodate the rods. placement of parts or for any other purpose. The end plates may be secured upon the sup- A further object of the invention is to provide porting rods in any suitable manner; for exin an electromagnetic device a novel armature ample, the ends of the rods may be threaded structure which is floatingly mounted so as to for the reception of fastening nuts 8. 25 be freely operable at all times and which is free In its specific adaptation as a recording device, of contact with the electromagnet core. the device comprises a conventional recorder or A still further object of the invention is to register 9 which may, for example, take the form provide o novelly constructed recording or regor a lever-type Voeder-Root register. As clearly istering device for telephone systems and the illustrated in Figs. 1 and 2, the recorder or reg- 30 like, which device has the several features above ister may be mounted upon brackets I0 having mentioned and others set forth hereinafter. sleeve or collar portions Il which are adapted to 'I'he invention may be more clearly understood t snugly upon the supporting rods I. These by reference to the accompanying drawing illusbrackets may be removably mounted upon two trating a specific embodiment, it being underof the supporting rods and for convenience, the 35 stood, however, that the invention is not limited recorder or register may be considered as being thereby. e mounted upon the front of the device. The In the drawing: supporting brackets I0 may be removably fixed in Fig. 1 is a front elevational view of the device; proper position upon the supporting rods I by 40 Fig. 2 is a side elevational view of the device means of sleeves l2, I8 and Il positioned as clear- 40 Fig. 3 is an enlarged fragmentary sectional ly illustrated in Fig. 3. view illustrating the supporting structure more In order to obtain the required actuation of the clearly; recorder or register from a small movement of Fig. 4 is a sectional view taken along line the electromagnetic armature, the lever system 4-4 o f Fig. 2; shown more clearly in Fig. 2 may be employed. 45

Fig. 5 is a sectional view taken along line 5 5 Ihe lever I5 extending from the recorder shaft ofFig.2; may Vbeconnected by a link I0 to a lever I1 Fig. 6 is an enlarged fragmentary sectional which may be pivotally connected to an extendview illustrating more clearly the armature struc ing lug Il of a bracket I9 (see Fig. 9). Bracket ture and mounting therefor; Il may comprise sleeve portions 20 ltting snugly 50 Fig. 7 is a perspective view of an element of upon the supporting rods I at the back of the the armature structure; device and removably flxed in position on the Fig. 8 is a perspective view of a spring which rods by means of sleeves 2l and 2.2. The lever may be employed 1n the armature structure; and I1 may be connected to the amature by means Fig. 9 is a perspective view of a bracket. of a link 23. It will be understood that the 5I lever system may be modified and, if desired, levers may be provided on either or both sides of the device.

A very important feature of the invention is the structure and mounting of the armature structure 24. In accordance with the invention, the armature consists of a thin light-weight plate structure iioatingly mounted upon the supporting rods i. In the specific structure illustrated, there is provided a thin plate 25 formed of lightweight non-magnetic material, such as iibre, and having apertures or openings of such size as to accommodate the supporting rods i and the sleeves 6 positioned thereon, as shown clearly in Fig. 3. Thus, the thin light-weight plate 25 is slidably mounted upon the supporting rods. A cruciiorm magnetic element 25 (see Fig. '7) formed of thin sheet metal is disposed on one side of plate 25 and has the outer extremities of its arms secured to plate 25 by means of rivets or the like 21. The plate 25 is provided with a central opening 28 which is of slightly smaller dimension or area than the end of the electromagnet core 3, as shown in Fig. 6. The central i portion of the cruciform magnetic element 26 isoiset as at 29 and extends into the opening 28, as clearly shown in Fig. 6. To insure that the offset portion 28 will be maintained within the opening 28, leaf springs 30 (see Fig. 8) may be secured at one end to the plate 25 by the fastening elements 21. The free ends of the springs may be arranged so as to press the centrai portion of the cruciform element in the desired manner.

It will be seen that the offset portion 29 of the magnetic element of the armature is cooperatively arranged with the electromagnet core 3 and is adapted to be attracted thereby, but the portion 29 is prevented from coming into actual Contact with the core because the opening 28 is smaller than the end of the core, as above mentioned. Therefore, when the device operates, the portion of the non-magnetic plate 25 about the opening 28 abuts against the core 3 and prevents contact of the portion 28 therewith. This eliminates any sticking tendency of the armature, which is inherent in devices wherein the armature contacts the magnet core, particularly after considerable usage. As the same time, the desired electromagnetic association between the armature and the core is maintained. Furthermore, by employing a thin light-weight nonmagnetic supporting plate and by employing a thin magnetic element of reduced area, the weight of the armature unit is reduced to a minimum. The light-weight non-magnetic plate functions eiliciently as a freely slidable supporting member for the armature structure and when formed of insulating material, this plate insulates the conductive part of the armature structure from the general supporting structure. The use of four supporting rods also insures smooth sliding action and prevents binding or sticking of the armatureregardless oi' the position of the device. Moreover, the parts of the armature structure may be economically formed by stamping them from sheet material.

`In order to urge the armature to its inoperative position, there are provided coil springs 3| interposed between the plate 2l and the adjacent plate 4 of the electromagnet unit. It will be seen that these springs will insure that the armature returns to its inoperative position regardless of the position of the device in any instance. It may be noted also that the -spring of the recorder or register will assist the springs 3 I.

It will be seen that the armature movement l may be varied by modifying the lever system. The rods i and sleeves 6 are sufciently long to permit of such variation. Moreover, the electromagnet unit and the recorder may be adjusted to any desired position along the rods I by employing sleeves of varying lengths.

The extremities of the electromagnet winding may be connected to terminals 32 mounted upon the upper plate 4 of the electromagnet unit. Thus electrical connection to the device may be made simply by connecting to the terminals 32. There are also preferably provided contacts 34 mounted upon the lower plate 4 of the electromagnet unit, which plate may be formed of insulating material, the contacts 34 being arranged for cooperation with two of the metallic fastening elements 21. Conductors 33 may be connected between contacts 34 and terminals 32. With this arrangement, it will be seen that when the device is actuated, the engagement oi' the elements 21 with the contacts 34 will place ashunt about the electromagnet Winding, which shunt includes the conductive-element 26 of the armature. Thus. this element of the armature is made to serve this additional purpose.

'Ihus the device is adapted for the provision of a novel shunting arrangement when desired,

it being well known in the art that such a shunt is often desirable. It will be noted, also, that the device may be used as a relay by omitting the conductors 33 and connecting the circuit to be controlled to the contacts 34. adapted for varied electrical association with other devices. Moreover, the mechanical movement of the device may be used in conjunction with other devices. Hence, the device is adaptable Ior mechanical or electrical cooperation with other devices.

It will be understood that in its adaptation as a device for recording the number of telephone calls, the device may be connected to any suitable part of the telephone system in accordance with the conventional methods.

Although the invention has been described with specific reference to the illustrated embodiment, it will be understood that various changes and modications may be made while retaining the inventive features set forth more clearly in the appended claims.

I claim:

1. An electromagnetic device, comprising an electromagnet having a core, an armature including a thin non-magnetic plate having an opening adjacent said core, and a magnetic member carried by said plate and having a portion extending into said opening for cooperation with said core, and supporting and guiding means for said armature comprising a plurality of, parallel rods slidably carrying said plate in cooperative relation with said electromagnet, whereby said device may beoperated in any position.

2. An electromagnetic device, comprising an electromagnet having a core, an armature including a thin non-magnetic plate having an opening adjacent said core, a magnetic member carried by said plate and having a portion extending into said opening for cooperation with said core, and spring means maintaining said portion within said opening. and supporting and guiding means for said amature comprising a plurality oi' parallel rods slidably carrying said Thus the device' is Cil plate in cooperative relation with said electro- 75 magnet, whereby said device may be operated in any position.

3. An electromagnetic device comprising a supporting framework comprising a plurality of parallel rods and transverse elements removably securing said rods together in a unitary assembly, an electromagnet, supporting end plates for said electromagnet having openings for reception of said rods, means comprising spacer sleeves for maintaining said plates in proper position on said rods between said transverse elements, and lan armature slidably carried by said rods in cooperative relation with said electromagnet, whereby said device may be operated in any position.

4. An electromagnetic device, comprising a supporting framework comprising a plurality of parallel rods and transverse elements removably securing said rods together in a unitary assembly, an' electromagnet having a. core removably supported on said rods, and an armature slidably carried-by said rods in cooperative relation with said electromagnet, said amature comprising a thin non-magnetic plate slidably carried by said rods and having an opening adjacent said core, and a magnetic member carried by said plate and having a portion extending into said opening for cooperation with said core.

5. An electromagnetic device, comprising an electromagnet having a core, an armature including a thin non-magnetic plate having an opening adjacent said core, a cruciform magnetic member carried by said plate and having a central portion extending into said opening for cooperation with said core, and a plurality of leaf springs carried by said plate and arranged to press said portion into said opening, and supporting and guiding means for said armature comprising a plurality of parallel rods slidably carrying said plate in cooperative relation with said electromagnet, whereby s aid device may be operated in any position.

6. An electromagnetic device comprising a supporting framework including a plurality ofparallel rods, an electromagnet, supporting means for said electromagnet having openings for reception of said rods, means comprising spacer sleeves for maintaining said supporting means inproper position on said rods, and an armature slidably carried by said rods in cooperative relation with said electromagnet, whereby said device may be operated in any position.

ALEXANDER STEIN. 

